无水有机醇介质中盐酸对蜡质玉米淀粉性质的影响

以无水甲醇、无水乙醇、异丙醇及正丁醇作溶剂,用盐酸对蜡质玉米淀粉进行改性。研究了蜡质玉米淀粉在有机醇溶液中酸改性前后的物化性质。结果表明经酸处理的蜡质玉米淀粉随有机醇介质(从甲醇到正丁醇)碳原子数量的增加,颗粒表面逐步出现小孔直到产生裂纹,冻融稳定性依次减弱,溶解度逐渐增大,膨胀度逐渐降低;淀粉的晶型基本没有变化,但对应衍射峰强度减弱。以上结果表明酸在不同有机醇介质中对淀粉的作用程度不同,从甲醇到丁醇依次增强。

Properties of Waxy Corn Starch Treated in Different Aanhydrous Alcohols with Hydrochloric Acid

The physicochemical properties of waxy corn starch was studied before and after treated in anhydrous alcohols with acid. Waxy corn starch was treated in anhydrous methanol, ethanol, 2-propanol and 1-butanol with hydrochloric acid. The results showed that the surface was porous after starch acid-alcohol treated, and the fissure on the surface of granules could be observed with the increasing of carbon number of alcohol. Acid-alcohol treatment decreased syneresis and the swelling power and increased the solubility as the increasing of carbon number of alcohol from ethanol to 1-butanol. The X-diffraciton pattern did not changed, but the intensities of the major d-spacings decreased after acid-alcohol treatment. The foregoing data showed starch could be made more susceptible to acid hydrolysis in different alcohols from methanol to 1-butanol.